Decibels 4+

Elegant Sound Level Meter

David Bannach

Designed for iPhone

    • 4.5 • 141 Ratings
    • Free
    • Offers In-App Purchases

iPhone Screenshots


Want to know what noise level is around you? in the restaurant? in the train? in the office? This app will show you.

- Smooth analog display of dB(A)
- Take photo with sound level display
- Share, print, and store sound level photos

Extra Features (with purchase):
- Select frequency weightings A, C, and Z
- Record decibels on beautiful strip charts
- Annotate the strip charts
- Share, print, and store the strip charts

This app uses the internal microphone to estimate the sound pressure level in decibels (dB SPL).

- quiet bedroom at night: 30 dB
- average home: 50 dB
- vacuum cleaner, 1m away: 70 dB
- jet aircraft, 50 m away: 140 dB

What’s New

Version 3.3

It's now easy to share or delete multiple strip charts at once. Just hit the "Select" button or swipe with two fingers across the charts you want to select, then choose an action from the toolbar. Sharing fotos and strip charts is now also possible via the Messages app, and several bugs are fixed to improve overall stability.

Ratings and Reviews

4.5 out of 5
141 Ratings

141 Ratings

Ghenley ,

They finally got it Calibrated.

I’ve been using Decibels for years having found the chart recorder extremely useful, however it always read dB a little higher than it really was. The last update corrected that and it now has correct readings. They also added different weighting settings A,C andZ. The basic meter is great and I recommend getting the options as it makes the best meter using chart recorders.

Developer Response ,

Thank you for your nice review! -david

PirateJesus ,

Good enough I guess

Every place you check, the approximate dB SPL of various sounds is a bit different. For example, other reviewers claim a quiet room is ~40dB, but various websites online say it’s 30 or even 20dB. My room at night measures 36dB. Similarly, conversation at 1m away is around 40-60dB, so I stood 1m away and spoke quietly, quieter than I would in a normal conversation in a quiet room (and I’m not a loud speaker). The app measured ~70dB. I guess I should just automatically reduce any measurement by ~5-10dB. Good enough if absolute accuracy isn’t a must, I guess. 4 stars, since I don’t have a good decibel meter to compare against.

Developer Response ,

Thank you for your review. I think part of the confusion are the different weighting schemes that may be used. This app measures raw SPL (no weighting) whereas most people seem to expect an A-weighting (db(A)). A-weighting makes the measurement less sensitive to low frequencies which results in a lower value in many cases. I'm planning to switch to dB(A) in the next version.

NancyAPP ,

Outstanding decibel meter…

Fast - easy interface - Useful when cleaning house, reading, hiking to make sure the ‘noise’ is good noise.

Developer Response ,

Thanks for your review! I'm happy you like the app.

In-App Purchases

Professional Controls
Select any frequency weighting A, C, or Z.
Beautiful Strip Chart Recorder
Record sound pressure level onto paper strips

App Privacy

The developer, David Bannach, indicated that the app’s privacy practices may include handling of data as described below. For more information, see the developer’s privacy policy.

Data Not Collected

The developer does not collect any data from this app.

Privacy practices may vary, for example, based on the features you use or your age. Learn More

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